The nature of the near-infrared interline sky background using fibre Bragg grating OH suppression

@article{Trinh2013TheNO,
  title={The nature of the near-infrared interline sky background using fibre Bragg grating OH suppression},
  author={Christopher Q. Trinh and Simon C. Ellis and Joss Bland-Hawthorn and Anthony J. Horton and Jonathan S. Lawrence and Sergio G. Leon-Saval},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2013},
  volume={432},
  pages={3262-3277}
}
  • C. Trinh, S. Ellis, S. Leon-Saval
  • Published 2 January 2013
  • Physics, Environmental Science
  • Monthly Notices of the Royal Astronomical Society
We analyse the near-infrared interline sky background, OH and O2 emission in 19 hours of H band observations with the GNOSIS OH suppression unit and the IRIS2 spectrograph at the 3.9-metre Anglo-Australian Telescope. The observations cover a range of sky positions with varying lunar conditions throughout the night. We find that the temporal behaviour of OH emission is best described by a gradual decrease during the first half of the night followed by a gradual increase during the second half of… 

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References

SHOWING 1-10 OF 36 REFERENCES

The case for OH suppression at near-infrared wavelengths

We calculate the advances in near-infrared (NIR) astronomy made possible through the use of fibre Bragg gratings to selectively remove hydroxyl emission lines from the night sky spectrum. Fibre Bragg

New approach to atmospheric OH suppression using an aperiodic fibre Bragg grating.

TLDR
An aperiodic fibre Bragg grating is demonstrated which performs 94% suppression of OH emission in the 1.50-1.57microm window at a resolving power of R=10,000, a working prototype for a device which will allow comparable levels of OH suppression at R=50,000 across the entire near infrared (1.0-2.0microm) spectrum.

A Calibrated Measurement of the Near-IR Continuum Sky Brightness Using Magellan/FIRE

We characterize the near-IR sky background from 308 observations with the Folded-port InfraRed Echellette (FIRE) spectrograph at Magellan. A subset of 105 observations selected to minimize lunar and

Suppression of the near-infrared OH night sky lines with fibre Bragg gratings - first results

The background noise between 1 and 1.8 ?mu m in ground-based instruments is dominated by atmospheric emission from hydroxyl molecules. We have built and commissioned a new instrument, the Gemini

GNOSIS: THE FIRST INSTRUMENT TO USE FIBER BRAGG GRATINGS FOR OH SUPPRESSION

The near-infrared is an important part of the spectrum in astronomy, especially in cosmology because the light from objects in the early universe is redshifted to these wavelengths. However, deep

The COBE Diffuse Infrared Background Experiment Search for the Cosmic Infrared Background. II. Model of the Interplanetary Dust Cloud

The COBE Diffuse Infrared Background Experiment (DIRBE) was designed to search for the cosmic infrared background (CIB) radiation. For an observer confined to the inner solar system, scattered light

A complex multi-notch astronomical filter to suppress the bright infrared sky.

TLDR
A filter capable of selectively removing very bright, very narrow hydroxyl emission lines while retaining high throughput between them is demonstrated for the first time, presenting results from the first on-sky tests.

PRAXIS: a low background NIR spectrograph for fibre Bragg grating OH suppression

Fibre Bragg grating (FBG) OH suppression is capable of greatly reducing the bright sky background seen by near infrared spectrographs. By filtering out the airglow emission lines at high resolution

A method to remove residual OH emission from near-infrared spectra

I present a technique to remove the residual OH airglow emission from near-infrared spectra. Historically, the need to subtract out the strong and variable OH airglow emission lines from 1 to 2.5-μm